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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [snb] External DP monitor goes black during heavy display activity"
href="https://bugs.freedesktop.org/show_bug.cgi?id=59824#c15">Comment # 15</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [snb] External DP monitor goes black during heavy display activity"
href="https://bugs.freedesktop.org/show_bug.cgi?id=59824">bug 59824</a>
from <span class="vcard"><a class="email" href="mailto:daniel@ffwll.ch" title="Daniel Vetter <daniel@ffwll.ch>"> <span class="fn">Daniel Vetter</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=59824#c14">comment #14</a>)
<span class="quote">> (In reply to <a href="show_bug.cgi?id=59824#c13">comment #13</a>)
> > (In reply to <a href="show_bug.cgi?id=59824#c12">comment #12</a>)
> > > Tested with drm-intel-nightly 06653b7 and experienced the same problem.
> >
> > Can you please boot with drm.debug=0xe and check whether you see any "FIFO
> > underrun" reports?
>
> Playing 4k youtube video, the screen went back and this was logged :
>
> [drm:ilk_display_irq_handler], Pipe B FIFO underrun
> [drm:cpt_serr_int_handler], PCH transcoder B FIFO underrun</span >
Can you please attach the complete dmesg (with debugging enable) where an
underrun happens? Just so that we have a bit of context of what's going on
around. But sounds like you need the watermark fixes Ville is working on.</pre>
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